6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2025

GRUPO AEROPORTUARIO DEL SURESTE, S.A.B. de C.V.

(SOUTHEAST AIRPORT GROUP)

(Translation of Registrant’s Name Into English)

México

(Jurisdiction of incorporation or organization)

Bosque de Alisos No. 47A– 4th Floor

Bosques de las Lomas

05120 México, D.F.

(Address of principal executive offices)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

(If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- .)

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: May 05, 2025

Exhibit 99.1

ASURAnnounces Total Passenger Traffic for April 2025

Passenger traffic increased year-on-yearby 13.5% in Puerto Rico, 4.8% in Colombia and 0.5% in Mexico

Mexico City, May 5, 2025 - Grupo Aeroportuariodel Sureste, S.A.B. de C.V. (NYSE: ASR; BMV: ASUR), ASUR, a leading international airport group with operations in Mexico, the U.S. and Colombia, today announced that passenger traffic for April 2025 reached a total of 6.0 million passengers, representing an increase of 3.8% compared to April 2024.

Passenger traffic presented year-over-year increases of 13.5% in Puerto Rico, 4.8% in Colombia, and 0.5% in Mexico. Passenger traffic growth in Puerto Rico was driven by increases of 29.6% in international traffic and 11.6% in domestic traffic, while Colombia reported increases of 15.6% in international traffic and 2.0% in domestic traffic. In Mexico, a 3.3% decrease in international traffic was partially offset by a 5.1% increase in domestic traffic.

All figures in this statement reflect comparisons between the period from April 1 to 30, 2025 and from April 1 to 30, 2024. Note that last year Holy Week took place during the last week of March 2024, while this year took place in April. Figures excluded transit and general aviation passengers for Mexico and Colombia.

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About ASUR

Grupo Aeroportuario del Sureste, S.A.B. de C.V. (ASUR) is a leading international airport operator with a portfolio of concessions to operate, maintain and develop 16 airports in the Americas. This comprises nine airports in southeast Mexico, including Cancun Airport, the most important tourist destination in Mexico, the Caribbean and Latin America, and six airports in northern Colombia, including Medellin international airport (Rio Negro), the second busiest in Colombia. ASUR is also a 60% JV partner in Aerostar Airport Holdings, LLC, operator of the Luis Muñoz Marín International Airport serving the capital of Puerto Rico, San Juan. San Juan’s Airport is the island’s primary gateway for international and mainland-US destinations and was the first, and currently the only major airport in the US to have successfully completed a public–private partnership under the FAA Pilot Program. Headquartered in Mexico, ASUR is listed both on the Mexican Bolsa, where it trades under the symbol ASUR, and on the NYSE in the U.S., where it trades under the symbol ASR. One ADS represents ten (10) series B shares. For more information, visit www.asur.com.mx.

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